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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.api import HasTraits, Str, Undefined, ReadOnly, Float
class Foo(HasTraits):
name = Str()
original_name = ReadOnly
bar = Str
baz = Float
def _name_changed(self):
if self.original_name is Undefined:
self.original_name = self.name
class Bar(HasTraits):
name = Str(Undefined)
class UndefinedTestCase(unittest.TestCase):
def test_initial_value(self):
b = Bar()
self.assertEqual(b.name, Undefined)
def test_name_change(self):
b = Bar()
b.name = "first"
self.assertEqual(b.name, "first")
def test_read_only_write_once(self):
f = Foo()
self.assertEqual(f.name, "")
self.assertIs(f.original_name, Undefined)
f.name = "first"
self.assertEqual(f.name, "first")
self.assertEqual(f.original_name, "first")
f.name = "second"
self.assertEqual(f.name, "second")
self.assertEqual(f.original_name, "first")
def test_read_only_write_once_from_constructor(self):
f = Foo(name="first")
f.name = "first"
self.assertEqual(f.name, "first")
self.assertEqual(f.original_name, "first")
f.name = "second"
self.assertEqual(f.name, "second")
self.assertEqual(f.original_name, "first")
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